docs: add GitHub issue templates (bug report + feature request)

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: 🐛 Bug Report
+description: Report a bug or unexpected behavior
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for reporting a bug! Please fill in the details below.
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: A clear description of the bug.
+      placeholder: What happened?
+    validations:
+      required: true
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to Reproduce
+      description: How can we reproduce this?
+      placeholder: |
+        1. Go to '...'
+        2. Click on '...'
+        3. See error
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected Behavior
+      description: What did you expect to happen?
+    validations:
+      required: true
+  - type: textarea
+    id: screenshots
+    attributes:
+      label: Screenshots
+      description: If applicable, add screenshots.
+  - type: dropdown
+    id: browser
+    attributes:
+      label: Browser
+      options:
+        - Chrome
+        - Firefox
+        - Safari
+        - Edge
+        - Other
+  - type: input
+    id: version
+    attributes:
+      label: PinchChat Version
+      description: Commit hash or version tag
+      placeholder: e.g. main @ abc1234

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: 💬 OpenClaw Discord
+    url: https://discord.com/invite/clawd
+    about: Chat with the OpenClaw community

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: ✨ Feature Request
+description: Suggest a new feature or improvement
+labels: ["enhancement"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Have an idea to make PinchChat better? We'd love to hear it!
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem or Motivation
+      description: What problem does this solve, or what's missing?
+      placeholder: I'm always frustrated when...
+    validations:
+      required: true
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed Solution
+      description: Describe the feature or change you'd like.
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives Considered
+      description: Any other approaches you've thought about?
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional Context
+      description: Screenshots, mockups, or links.